Likely, you'll have to drop the tranny. From the diagrams, it doesn't look like the sensor pack is inside the interior (which makes sense, especially to keep all the important components centralized), which I imagine the sensors would be cheap, but the labor would be a bundle.
Sensors don't necessarily have short life-spans. I have a 20 year old car and 90% of the sensors are original. Hell, I've even seen O2 sensors last more than 10 years and those get seriously messed up easily.
I won't worry about it. If in the first year or two the sensors don't go bad, than they're likely not to go bad for a long while without a 3rd party physically affecting them. (i.e. car crash or bottoming out) But if they do go out early, it's likely that Nissan will see they're defective and do a recall on the sensors. It would cost them a LOT in warranty work not to.
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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary
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